package io.renren.utils;

/**
 * @Title: randomUtil.java
 * @Package org.csun.nc.util
 * @Description: TODO
 * @author chisj chisj@foxmail.com
 * @date 2017年5月7日
 */

import java.util.Random;

/**
 * ClassName: randomUtil
 * @Description: 随机数工具类
 * @author chisj chisj@foxmail.com
 * @date 2017年5月7日
 */
public class RandomUtils {

    //方法1
    public static int nextInt1(final int min, final int max) {
        Random rand= new Random();
        int tmp = Math.abs(rand.nextInt());
        return (tmp % (max - min + 1) + min);
    }

    //方法2：不会生成小于100000的数
    public static int nextInt2() {
        Random random = new Random();
        int x = random.nextInt(899999);
        //int x = x+100000;
        return x;
    }

    //方法3
    public static int nextInt3() {
        int n = 0 ;
        while (n < 100000) {
            n = (int)(Math.random()*1000000);
        }
        //System.out.println(n);
        return n;
    }

    //方法4
    public static int nextInt4() {
        String str = "";
        str += (int)(Math.random()*9+1);
        for(int i = 0; i < 5; i++){
            str += (int)(Math.random()*10);
        }

        int num = Integer.parseInt(str);
        //System.out.println(num);

        return num;
    }

    //方法5
    //System.out.println((int)((Math.random()*9+1)*100000));

    //方法6
    public static String nextInt6() {
        Random random = new Random();
        String result="";
        for(int i=0;i<6;i++){
            result+=random.nextInt(10);
        }
        //System.out.print(result);
        return result;
    }
}